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First Night's Effort

A project log for e-NABLE Spidey Sensors

Sensors and Actuators provide super powers to kids wearing e-NABLE assistive devices such as artificial hands.

les-hallLes Hall 03/19/2015 at 19:000 Comments

Last night I worked into the wee hours (hence sleeping until lunch) to create this circuit:

bottom center is a microphone, a high output power rail-to-rail opamp above it, some electrolytic capacitors, missing and added later is anATtiny85 processor and Adafruit neopixel, the RED power indicator LED is removed, upper left is the USB power input, not shown is the battery power input (diode ORed), and audio jack output.

The circuit is somewhat noise and very sensitive. I want to add diodes in the opamp feedback loop for commanding, increase the number ofopamp stages to three, and use a low noise dual opamp for the first two. But I am working with what I have right now.

I plan to tinker around a bit with the component values, much of which I already have done, do the processor programming, and transfer the circuit to an Adafruit PermaProtoBoard (1/2 sized as shown above) for installation with a parabolic dish on a hand.

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